• ICALEO 2007 Paper #1604 (Study of the Phenomena of Fiber Laser-MAG Hybrid Welding)

    Study of the Phenomena of Fiber Laser-MAG Hybrid Welding
    Authors:
    Anna Fellman, Lappeenranta Univ. of Technology; Lappeenranta Finland
    Antti Salminen, Lappeenranta Univ. of Technology; Lappeenranta Finland
    Presented at ICALEO 2007

    Laser hybrid welding processes are gaining more interest in many sectors of metal industry. The process is already in successful use for example in automotive, ship building and construction industry. The laser hybrid welding processes are traditionally a combination of CO2 or Nd:YAG laser together with MIG/MAG or TIG welding. The arc welding source is chosen depending on whether there is also need for extra material. The maximum powers available for thes...

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  • ICALEO 2007 Paper #1606 (Laser Alloying of Aluminum using a Deep Penetration Process with Fiber Laser)

    Laser Alloying of Aluminum using a Deep Penetration Process with Fiber Laser
    Authors:
    Knut Partes, BIAS; Bremen Germany
    Frank Vollertsen, BIAS; Bremen Germany
    G. Habedank,, BIAS; Bremen Germany
    Thomas Seefeld, BIAS; Bremen Germany
    Presented at ICALEO 2007

    Today laser alloying of Aluminum is a well known technique in order to increase the wear resistance of parts. The process is typically limited in depth to about 1 mm. In this study it is shown that a deeper alloying is possible by using the deep penetration effect caused by a highly intensive laser beam. The laser beam is scanned in a circular motion in order to control the track profile. By this manner o...

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  • ICALEO 2007 Paper #1607 (Welding of Ti-6Al-4V with Fibre Delivered Laser Beams)

    Welding of Ti-6Al-4V with Fibre Delivered Laser Beams
    Authors:
    Paul Hilton, TWI Ltd.; Great Abington, Cambridge Great Britain
    Jonathan Blackburn, Laser Processing Research Centre, The University of Manchester; Manchester Great Britain
    Pak Chong, Welding and Materials; Aberdeen Great Britain
    Presented at ICALEO 2007

    Titanium alloys offer higher strength to weight ratios than steels, better fatigue performance than aluminium alloys and better corrosion resistance than aluminium alloys and stainless steels and are now increasingly used in applications in the aerospace, chemical plant, power generation, oil and gas, medical and sporting goods sectors. For aerospace applica...

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  • ICALEO 2007 Paper #1608 (Fibre Laser GMA Hybrid Welding of Thin Sheet Material)

    Fibre Laser GMA Hybrid Welding of Thin Sheet Material
    Authors:
    Claus Thomy, BIAS; Hambergen Germany
    Frank Vollertsen, BIAS; Germany
    Thomas Seefeld, BIAS; Bremen Germany
    Presented at ICALEO 2007

    In order to restrain heat input and increase productivity in thin steel sheet welding compared to arc and laser welding processes, a laser GMA hybrid welding process with single-mode fibre laser was developed. The effects of some basic parameters such as laser power, focal position and laser arc distance were investigated and discussed in view of weld quality and process efficiency. Moreover, the influence of gap on weld quality, hardness and static strength was considered. Ba...

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  • ICALEO 2007 Paper #1609 (Zinc Sulfide Optics for High Power Laser Applications)

    Zinc Sulfide Optics for High Power Laser Applications
    Authors:
    Stanley Ream, EWI; Columbus OH USA
    Wei Zhang, EWI; Columbus OH USA
    Craig Walters, CWA; Dublin OH USA
    Greg Firestone, EWI; Columbus OH USA
    Presented at ICALEO 2007

    As higher power disc and fiber lasers become available, questions arise concerning the stability and durability of focusing optics. Even at familiar YAG power and brightness (i.e. 4 kW from 600 um fiber) focusing optics are known to exhibit shifts in position and changes in focal spot size. At higher power levels these focusing issues will become significantly more troublesome. Traditional 1.06/1.07 um focusing optics are construc...

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  • ICALEO 2007 Paper #1701 (Precipitating Behavior of In Situ Synthesized Multiple Carbide Particles in Laser Cladded MMC Coating)

    Precipitating Behavior of In Situ Synthesized Multiple Carbide Particles in Laser Cladded MMC Coating
    Authors:
    Chaofeng Wu, Tsinghua Univ.; Beijing Peoples Republic of China
    Mingxing Ma, Tsinghua University; Beijing Peoples Republic of China
    Minlin Zhong, Tsinghua University; Beijing Peoples Republic of China
    Wenjin Liu, Tsinghua Univ.; Beijing Peoples Republic of China
    Weiming Zhang, Tsinghua University; Beijing Peoples Republic of China
    Hongjun Zhang, Tsinghua University; Beijing Peoples Republic of China
    Presented at ICALEO 2007

    Metal matrix composite (MMC) has attracted extensive investigation in material science and engineeri...

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  • ICALEO 2007 Paper #1702 (Hot-wire Cladding Process Studies)

    Hot-wire Cladding Process Studies
    Authors:
    Janne Nurminen, Technology Centre Ketek Oy; Kokkola Finland
    Jouko Riihimaki, Technology Centre Ketek Oy; Kokkola Finland
    Jonne Nakki, Technology Centre Ketek Oy; Kokkola Finland
    Petri Vuoristo, Technology Centre Ketek Oy, Tampere University of Technology; Kokkola Finland
    Presented at ICALEO 2007

    Hot-wire laser cladding is a coating method with excellent properties and high deposition rate. Process is rather simple and fundamental relationships of basic parameters like laser power, amperage, voltage, travel speed and spot sizehave been studied experimentally. Solid wires are easily melted by the melt pool generated...

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  • ICALEO 2007 Paper #1703 (Experimental Investigation of Residual Stresses Generated during Laser Cladding)

    Experimental Investigation of Residual Stresses Generated during Laser Cladding
    Authors:
    B Pathiraj, University of Twente; Enschede Netherlands
    Johannes Hofman, Netherlands Institute for Metals Research; Enschede Netherlands
    J Meijer, University of Twente; Enschede Netherlands
    Presented at ICALEO 2007

    Residual stresses are an important parameter in the process optimization of laser cladding. An important parameter in the process optimization is the residual stresses. These stresses are caused by high thermal gradients and therefore differential thermal contractions are present, as well as the different thermo mechanical properties of the joined materials. An experiment...

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  • ICALEO 2007 Paper #1704 (The Influence of Various Surface Conditions during Laser Transformation Hardening)

    The Influence of Various Surface Conditions during Laser Transformation Hardening
    Authors:
    Tshidiso Seleka, CSIR National Laser Centre; Pretoria Southwest Africa
    Sisa Pityana, CSIR; Pretoria Republic of South Africa
    Ken Labuschagne, CSIR; Pretoria Republic of South Africa
    Tanya Fedotova, Tshwane University of Technology; Pretoria Republic of South Africa
    Presented at ICALEO 2007

    This study focuses on the influence of different material surface conditions on the absorption characteristics of the laser beam. Flat rolled 5 mm thick locally manufactured Iscor Bennox® wear plate with a similar chemical composition to AISI 1055 was used as base material. This m...

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  • ICALEO 2007 Paper #1705 (In-situ Synthesis of Titanium Carbide Particles in Iron Matrix using Laser Cladding)

    In-situ Synthesis of Titanium Carbide Particles in Iron Matrix using Laser Cladding
    Authors:
    Christ Prakash Paul, University of Waterloo; Waterloo, ON ON Canada
    Amir Khajepour, University of Waterloo; Waterloo ON Canada
    Mehrdad Iravani, University of Waterloo; Waterloo ON Canada
    Stephen Corbin, University of Waterloo; Waterloo ON Canada
    Presented at ICALEO 2007

    Conventionally, the majority of reinforced phases are directly added into coating materials to form reinforcement in the matrix. The interface between the particles and matrix is often a potential source of weakness owing to different thermal expansion coefficients between them. When the surface of ...

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